Pencil with displaceable graphite core



Feb. 13, 1923. 1,444,978.

G. MEIER. PENCIL WITH DISPLACEABLE GRAPHITE CORE.

FILED MAY 27,192].

Inventor:

Patented Fee. 13, was.

GEORG MEIER, OF NU'REMBEEG, GERMANY.

PENCIL WITH DISPLACEABLE GRAIPHITE CORE.

Application filed May 27,

' T aZZ whom it may concern:

Be it known that I, GEORG MEIER, a citizen of the German Republic, and a resident of Nuremberg, Germany, have invented certain new and useful Improvements in Pencils with Displaceable Graphite Cores, of which the following is a specification.

This invention relates to a pencil having an inserted graphite core held in place by a clamping mouthpiece and being adapted to be shoved forward by a displaceable stem located within the shell of the pencil. The lower end of the stem acts upon the upper end of the graphite core and causes the lower end of this latter to project forth from the mouth-piece in order to be in writing position.

The difference between the novel construction forming thesubject-matter of this invention and the known constructions consists in the feature that the front shell which contains the graphite core in its clamping head is supported by a spring with respect to the rear slidable shell which contains the stem; the rear or upward motion of the slidable shell is limited by an abutment collar of the other shell against which the slidable shell is pressed by said spring which is compressed, when the slidable shell is displaced along the other shell in the direction towards the mouth piece, whereby the motion of the stem with respect to the graphite core is braked.

In this way an elastically influenced and braked motion of the stem with respect to the graphite core is ensured and the latter is prevented from being entirely pushed through the mouth piece as frequently occurs with pencils with freely movable graphite core which are operated by a nonbraked stem. An always uniform length of the projecting graphite end is the more ensured as the upper shell returns automatically into its former position after each actuation of the graphite core by the stem.

Another characteristic feature of the improved pencil consists in a longitudinally displaceable slotted clamping member arranged in the head of the pencil and receivingthe graphite core and forming the lower support for the above-mentioned spring, which presses the slotted member into the conical head of the lower shell whereby the graphite core is more securely held in place. The spring has, thus, a two- 1921. Serial No. 473,043.

fold eifect; it presses the two shells asunder, and improves the clamping action of the slotted member by making it co-act with the end of the respective shell. As the pressure of the spring is increased by shoving the upper shell downward upon the lower one for the purpose of re-adjusting the graphite core, the slotted member is subjected also to an additional pressure and caused to act correspondingly stronger upon the graphite core so as to warrant a practically positive re-adjustment of the graphite core whereby pushing this latter out of the mouth piece is entirely prevented, the more, as it is braked just during the readjustment. The slotted clamping member ofi'ers also the advantage that the graphite cores may have unequal diameters and are still securely held in place, whereas the graphite cores used with the known constructions of pencils of the kind in question must have the same diameter.

In order to make my invention more clear,

I refer to the accompanying drawing, in which Fig. 1 is a longitudinal section through a pencil constructed according to my invention; and Fig. 2 is a similar illustration, but partly in side-view, and showing the upper shell a little displaced upon the lower one in downward direction.

The pencil casing consists of the front shell 7' and the rear shell 1 which partly encompasses the former and may be displaced upon it for a certain length of way. The motion ,in that direction in which the pencil casing becomes longer is limited by a collar of the shell 7, as shown in Fig. 1. The outer end of the shell 7 contains an inserted member 8 which is slotted at 9 and may, if desired or preferred, be displaceable in said shell. At the outer end of the member 8 is a bore which receives the graphite core 10.

The shell 1 contains the stem 5 which is secured by caps 3 and 4 aliixed in their turn in the upper end of said shell. The stem 5 lies axially within the shell 1 and its free end extends into the inner end of the bore of the inserted member 8. A spring 6 encompassing the stem 5 tends constantly to move the two shells away from one another. The upper end of the spring abuts against the cap 3, the lower end abuts against the member 8.

The upper end of the shell 1 is closed by a removable cap 2 which forms, together with the cap a, a receptacle 11 for storing graphite cores.

When pressing upon the cap 2, the shell 1 is shoved downward along the shell 7 whereby the spring 6 is put under tension, or its pressure is increased respectively. At the same time, the stem 5 pushes upon the graphite core 10 and shoves it further out ward (Fig. 2) so as to Ire-adjust its writingend. Owing to the tension of the spring increasing when the shell 1 is displaced as just described, the braking action thereby pro-- duced counter-acts an eventual sudden push upon the shell 1 and prevents the stem from pushing the core 10 out of the mouth of the shell 7.

If the inserted member 8 is longitudinally displaceable within the split end or clamping mouth-piece 7 of the shell 7, as it shall generally be the case (although it is not indispensablynecessary), the increasing pressure arising on the spring 6 being com-- pressed forces the outer end of the member 8 somewhat deeper into the outer end of the shell 7 whereby the graphite core is still better held in place. Owing to the two reasons, viz, the stronger hold of the core within the member 8 and the braking action of the spring with respect to the push cap 2, the core is very securely prevented from being unintentionally completely pushed out of the shell mouth or casing mouth.

Having now described my invention, what I claim as new and desire to secure by Let ters Patent of the United States is:

1. A pencil, comprising, in combination, a

casing consisting of two shells adapted to be longitudinally displaced relatively to one an other; a clamping mouth piece at the writing end of said casing; an exchangeable graphite core in said mouth piece; a stem located within the casing and being conslotted member situated near to said mouth piece; a longitudinal bore through said member, the outer part of said bore being adapted to receive an exchangeable graphite core; a stem located within the casing and being connected with the shell opposite to said mouth piece and extending with its free end into the inner part of the bore of the said member; and a spring also arranged within the casing, between said shells, and abutting at one end against the said member and at the other end against the adjacent shell, substantially as described.

lln testimony whereof I aflix my signature in presence of two witnesses.

GEORG MEIER.

l Witnesses:

HEINRICH FIETH, GnoRe LEITNER. 

